We bought a used iphone 4 from someone for $50, and they told us it was unlocked from their network (Rogers). They gave us the 4 digit password to open the phone, and that's it. But when we went to get it activated with our local carrier, they said we had to "reset network settings" first. When we went to do this it is asking for the old users apple id password because it has "find my iphone" turned on. I don't know their password and can't get a hold of them now. Is there any other way to reset this phone or is it a waste of our $50? Any help would be appreciated.